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UTILIZATION OF AN AQUEOUS FLUOSILICIC ACID SOLUTION FOR THE PRODUCTION OF SODA AQUEOUS SOLUTION AND A MIXTURE OF CALCIUM SILICATE AND CALCIUM FLUORIDE

Aqueous fluosilicic acid solutions constitute interesting intermediate reagents in the manufacturing of numerous chemicals. However they are sometime considered as simple by-products which are at the origin of a relatively former environmental preoccupation in phosphoric acid and fertilizer production. Indeed a whole range of chemicals can be generated by the transformation of this industrial waste. Among these chemicals, distinguish itself soda, which is an essential substance in the industrial practice, as well as calcium fluoride and calcium silicate which are frequently used in cement industry. In this work, fluosilicic acid is converted into sodium fluosilicate which is treated by lime to obtain soda and a mixture of calcium fluoride and calcium silicate. Experiments already made in laboratory showed the feasibility of this production of soda. The obtained yields can be about 70% for the reaction of caustification which generate 6% of NaOH aqueous solution. Analyses made on precipitates highlight compositions in essential and useful constituents in cement industry.


Auteur(s) : Alpha Ousmane Touré, Falilou Mbacké Sambe, Senghane Ndiaye, Codou Mar Gueye Diop, Oumar Sock
Pages : 105-112
Année de publication : 2011
Revue : Physical and Chemical News
N° de volume : 60
Type : Article
Mise en ligne par : TOURE Alpha Ousmane